Update app menu button MD colors for the notification case.

ui/gfx/color_palette.h

Index: ui/gfx/color_palette.h
diff --git a/ui/gfx/color_palette.h b/ui/gfx/color_palette.h
index 8b93e7b0afb50c10ab14a3543bc90d2f30232c72..c3f989f1feb3830dfbcd6db280ac28878d4ee2b3 100644
--- a/ui/gfx/color_palette.h
+++ b/ui/gfx/color_palette.h
@@ -9,11 +9,15 @@
 
 namespace gfx {
 
-const SkColor kAmber = SkColorSetRGB(0xFF, 0xC1, 0x07);
 const SkColor kChromeIconGrey = SkColorSetRGB(0x5A, 0x5A, 0x5A);
-const SkColor kErrorRed = SkColorSetRGB(0xC5, 0x39, 0x29);
 const SkColor kGoogleBlue = SkColorSetRGB(0x42, 0x85, 0xF4);
 
+// The number (700) refers to the shade of darkness. Each color in the MD
+// palette ranges from 100-900.
+const SkColor kGoogleRed700 = SkColorSetRGB(0xC5, 0x39, 0x29);
+const SkColor kGoogleGreen700 = SkColorSetRGB(0x0B, 0x80, 0x43);
+const SkColor kGoogleYellow700 = SkColorSetRGB(0xF0, 0x93, 0x00);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_COLOR_PALETTE_H_